The 1 lb roll of stainless steel wool is approximately 1/2" thick and 4" wide and is wound onto a 2" core to an outside diameter of about 6"; and is approximately 30 -35 feet long. It is enough material to wrap a 2" diameter baffle x 19" long to an outside diameter of approximately 5" when properly wrapped to the right tension. Stainless steel wool products withstand temperatures in excess of 700°C, exhaust acids and high vibration.